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SVHS LAB BIOLOGY
2007-2008
GENETIC PROBLEM WORKSHEET #1
T = tall
t = short
Traits of a pea plant:
R = round seeds
Y = yellow seeds
r = wrinkled seeds y = green seeds
Traits of Drosophilia Fruit Fly
N = normal wings
n = vestigial wings
1) Write the genotype for each of the following parents:
A) homozygous dominant for round seeds:
B) heterozygous for normal wings:
C) homozygous recessive for seed color:
D) homozygous for normal wings.
E) wrinkled seeds:
F) Vestigial wings:
G) Homozygous round seeds, homozygous green seeds:
H) Heterozygous round seeds, heterozygous yellow seeds:
2) Write the phenotypes for the following genotypes:
A) Tt =
B) rr =
C) NN =
D) nn =
E) Ttyy =
F) TtYy
Circle the genes
contained in each
gamete
3) Determine the different types of gametes that can be produced by the following organisms:
A) Tt =
B) TT =
C) tt =
D) rrTt=
E) RRtt=
F) ttRr=
G) TTYYrr
H) TtyyRR
I) TTaaRRYy
4) Cross a homozygous dominant tall pea plant with a short pea plant.
A)
B)
C)
D)
E)
Determine the gametes produced by the tall plant:
Determine the gametes produced by the short plant:
Determine the genotype and phenotype ratios of the offspring (F1).
What would be the chance of getting an offspring that was short?
Show the Punnet squares used to solve this problem.
5) Cross two offspring (F1) from the above cross. to form a second generation of offspring (F2).
A)
B)
C)
D)
E)
F)
G)
Determine the gametes of each parent.
Show the punnet squares used to solve the problem.
What is the expected phenotypic ratio of the F2?
What is the expected genotypic ratio of the F2?
What percent of the offspring will be tall?
Short?
What percent of the offspring will be TT?
Tt?
tt?
If 1000 pea plants were produced from the F1 cross, how many would be tall?
Short?
In humans the ability to roll your tongue is a dominant trait which will be represented by "R" and the lack of this
ability is recessive and is represented by the "r". The individuals which have been darkened in are recessive which
means they cannot roll their tongue. Below each circle (female) and each square (male) fill in the two genes each
individual. If you cannot tell for sure determine the probability for each potential genotype.
The gene for the condition known as cystic fibrosis is a recessive gene. The dominant for normal is "F" while the
recessive cystic fibrosis gene is "f". Fill in the genotypes for each person. If a person is unknown then place a
question mark for the unknown gene.